NH033 datasheet(12/20 Pages) LINEAGEPOWER

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NH033x-L and NH050x-L Series Power Modules:

Data Sheet

5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A

March 2010

Lineage Power

Design Considerations (continued)

Input Source Impedance (continued)

To further reduce the input reflected ripple current, a

filter inductor (LFILTER) can be connected between the

supply and the external input capacitors (see Figure

37). The filter inductor should be rated to handle the

maximum power module input current of 10 Adc for the

NH033x-L and 16 Adc for the NH050x-L.

If the amount of input reflected-ripple current is unac-

ceptable with an external L-C filter, more capacitance

may be added across the input supply to form a C-L-C

filter. For best results, the filter components should be

mounted close to the power module.

8-1216(C).a

Figure 37. Setup with External Input Filter to

Reduce Input Reflected-Ripple Current

and Ensure Stability

Output Capacitance

The NH033x-L and NH050x-L Series Power Modules

can be operated with large values of output capaci-

tance. In order to maintain stability, choose a capacitor

bank so that the product of their capacitance and ESR

is greater than 50 x 10–6 (e.g., 1,000 µF x 0.05

Ω =

50 x 10–6). For complex or very low ESR filters, consult

the Technical Support for stability analysis.

Safety Considerations

For safety-agency approval of the system in which the

power module is used, the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standard,

i.e., UL 60950, CSA C22.2 No. 60950-00, and VDE

0805 (IEC60950).

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), the

input must meet SELV requirements.

The power module has extra-low voltage (ELV) outputs

when all inputs are ELV.

The input to these units is to be provided with a maxi-

mum 20 A normal-blow fuse in the ungrounded lead.

Feature Descriptions

Overcurrent Protection

To provide protection in a fault condition, the unit is

equipped with internal overcurrent protection. The unit

operates normally once the fault condition is removed.

Under some extreme overcurrent conditions, the unit

may latch off. Once the fault is removed, the unit can

be reset by toggling the remote on/off signal for one

second or by cycling the input power.

Remote On/Off

To turn the power module on and off, the user must

supply a switch to control the voltage at the ON/OFF

pin (Von/off). The switch should be an open collector pnp

transistor connected between the ON/OFF pin and the

VI pin or its equivalent (see Figure 38).

During a logic low when the ON/OFF pin is open, the

power module is on and the maximum Von/off generated

by the power module is 0.3 V. The maximum allowable

leakage current of the switch when Von/off = 0.3 V and

VI = 5.5 V (Vswitch = 5.2 V) is 50 µA.

During a logic high, when Von/off = 2.8 V to 5.5 V, the

power module is off and the maximum Ion/off is 10 mA.

The switch should maintain a logic high while sourcing

10 mA.

Leave the remote ON/OFF pin open if not using that

feature.

The module has internal capacitance to reduce noise

at the ON/OFF pin. Additional capacitance is not gen-

erally needed and may degrade the start-up character-

istics of the module.

TO OSCILLOSCOPE

C 1

GND

SUPPLY

CURRENT

PROBE

LSOURCE

470 µF

LFILTER

C 2

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